单项选择题
For occasional heavy loads, two cranes can be arranged to work together. The operating （） for deck crane motors may be hydraulic electric.
A.principle
B.medium
C.instruction
D.voltage
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相关考题
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单项选择题
In a general cargo crane, three principal movements are （）； （）； （）.
A.hoisting；luffing；slewing
B.lifting；raising；lowering
C.rotating；raising；handling
D.hosting；lowering；moving -
单项选择题
A warp end may be fitted for operating the derrick topping wire which adjusts the derrick （）.
A.length
B.slack
C.height
D.rotation direction -
单项选择题
These include deck machinery such as mooring equipment, anchor handling equipment, cranes and （）.
A.boilers
B.bow thrusters
C.stabilizers
D.hatch covers
